Volume acid fracturing method for deep coal-bed gas well
A coalbed methane well and acid fracturing technology, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problem of large fracturing fluid fluid loss, opening that does not meet the entry conditions of proppant, and poor active water performance To achieve the effect of improving pore connectivity, avoiding re-closing and being unable to effectively use, and improving matrix permeability
Active Publication Date: 2021-01-26
PETROCHINA COALBED METHANE +1
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Problems solved by technology
[0003]
The opening of cleat fractures in the coal seam during the fracturing process leads to large fracturing fluid fluid loss, and the opening of secondary micro-fractures and cleat fractures opened at the far end does not meet the conditions for proppant entry, and the performance of active water is poor. End fractures are not easy to support, and closed after fracturing, eventually forming invalid fractures, which cannot meet the conditions for profitable development of low-porosity and low-permeability deep coal seams, affecting the effect of fracturing stimulation
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[0035] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0036] In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, use a specific orientation construction and operation, therefore should not be construed as limiting the application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be co...
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The invention discloses a volume acid fracturing method for a deep coal-bed gas well. The volume acid fracturing method comprises the following steps: a coal-bed structure is detected, and perforatingis conducted in the middle of a primary structure coal-bed; prepad fluid, sand-carrying fluid and displacement fluid are injected into the coal-bed in sequence through perforation, wherein the prepadfluid comprises active water and acid, a quartz sand slug is added during acid injection, the sand-carrying fluid comprises surfactant fracturing fluid, acid and a propping agent are carried when thesurfactant fracturing fluid is injected, the displacement fluid comprises active water and acid, a preset amount of active water is injected firstly, then the acid is injected, and then the active water is continuously injected. Acidic fracturing is used as a main process technology, through perforation position optimization, fracturing fluid system optimization and injection process optimization, pore connectivity is improved, matrix permeability is increased, a double-crack channel of a support crack and an acid-soluble crack is achieved, the hydraulic crack range of effective flow conductivity is enlarged, the influence of post-fracturing crack closing on the fracturing effect is weakened, and the yield is increased.
Description
technical field [0001] The invention relates to the technical field of coal bed gas well exploitation, in particular to a volumetric acid fracturing method for deep coal bed gas wells. Background technique [0002] Coal bed gas fracturing wells usually adopt the method of direct perforation and fracturing in coal seams, using active water fracturing fluids, and tests on liquid systems such as guar gum, slick water, and clean fracturing fluids have also been carried out in some areas. Sand fracturing method, forming hydraulic fractures with high permeability channels in the coal seam to increase the production of coalbed methane; or using the roof sandstone to implement indirect fracturing technology, using conventional hydraulic fracturing methods to form high permeability channels between the roof sandstone and the coal seam For hydraulic fractures of old wells, related acidification and plugging removal technology has been carried out to improve the fracture conductivity b...
Claims
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Login to View More IPC IPC(8): E21B43/27E21B43/267
CPCE21B43/26E21B43/267E21B43/006Y02P90/70
Inventor 徐凤银李曙光甄怀宾王成旺彭宏钊朱卫平陈帅袁朴陈高杰梁智飞
Owner PETROCHINA COALBED METHANE